2GB DDR2-667 (PC2-5300) RAM Memory Upgrade for The Acer Extensa 5620-4020 (Genuine A-Tech Brand) at Amazon.com
1GB RAM Memory for Acer Extensa 5620 Series Black Diamond Memory Module DDR2 SO-DIMM 200pin PC2-5300 667MHz Upgrade System Specific Memory - Newegg.com